Add optional support for winpty (pty for windows pre ConPTY)

[a-urth]

Since ConPTY appeared in windows only in late 2018, there is no native way to use pty before that. Although with help of winpty (https://github.com/rprichard/winpty) its possible.

It might be helpful to add it and make it possible to run full login shell in older windows versions. Surely its somewhat ugly approach which requires to bring additional dll and exe, although I couldn't find better approach.

Here is example https://github.com/NHAS/reverse_ssh/tree/main/pkg/winpty

[NHAS]

You can make this slightly less awful by loading (and executing) binaries into memory with a manual mapper for winpty.

You could use something like this: https://github.com/NHAS/stab in order to load the PE's which would mean you dont have to write anything to disk.

The only downside is this is a common technique for AV evasion and will probably get you binned

[photostorm]

I will look into it.